Mechanical property test sample clamp

Abstract

The utility model discloses a mechanical property test sample clamp which comprises a cylinder and a clamping piece, one end of the cylinder is clamped on a three-jaw chuck of a lathe, a square through hole is formed in the center of the cylinder in the axial direction, the square through hole is used for placing a square sample, a threaded hole is formed in the peripheral wall of the cylinder, and the threaded hole extends to the square through hole. When the sample clamp for the mechanical property test provided by the embodiment of the utility model is used for clamping a square sample, the square sample is partially embedded into the square through hole, so that the square sample is tightly propped against one side surface of the square through hole, and then the clamping piece is tightened to move towards the square sample; therefore, the square test sample is stably fixed in the square through hole. Compared with a four-jaw chuck adopted in the prior art, the mechanical property test sample clamp can adapt to square samples of different specifications and sizes, frequent chuck replacement and material center correction are not needed, the machining preparation time is greatly shortened, and the overall machining efficiency is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical processing technical field especially relates to a kind of mechanics performance test sample fixture. BACKGROUND

[0002] In the mechanical property testing of metal material, tensile, endurance and creep sample usually need to be further turned to standard size after sampling by sawing machine. The traditional sampling workshop generally uses three-jaw chuck to clamp the sample, but the three-jaw chuck is only suitable for clamping the sample with circular cross section, and the square sample cannot be stably fixed due to its geometric characteristics, resulting in low machining accuracy and poor efficiency. If you need to adapt to square sample, the conventional solution is to purchase four-jaw chuck or special fixture, but such equipment has high purchase cost, and four-jaw chuck is heavy (about 40 pounds), so frequent replacement has safety hazards. In addition, the workpiece center needs to be re-calibrated after replacing the chuck, which is complicated to operate and significantly increases the processing time and labor cost.

[0003] Therefore, the utility model is proposed to solve the above technical problems. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of mechanics performance test sample fixture to solve the technical problem that the clamp in the prior art is not convenient for square sample to be quickly clamped.

[0005] The technical scheme of the utility model is: a kind of mechanics performance test sample fixture, comprising:

[0006] cylindrical barrel, cylindrical barrel one end is clamped in the three-jaw chuck of lathe, cylindrical barrel center is provided with square through hole along its axial direction, square through hole is used to place square sample, threaded hole is provided in the outer peripheral wall of cylindrical barrel, threaded hole extends to square through hole;

[0007] clamping part, clamping part is screwed in threaded hole, clamping part is used to clamp square sample, and the diagonal line of the end face of clamping part is parallel to square through hole.

[0008] Further, the clamping part includes a screw rod, the screw rod is threadedly connected with the threaded hole, and the screw rod is provided with a rotatable head near the end close to the square sample, and the straight-angle opening is formed in the end of the head away from the screw rod.

[0009] Further, the outer peripheral wall of the end of the cylindrical barrel away from the three-jaw chuck is provided with an annular groove, and the counterweight structure is arranged in the annular groove.

[0010] Further, the counterweight structure includes an annular swivel ring, the annular swivel ring is rotatably arranged in the annular groove, the outer peripheral wall of the annular swivel ring is uniformly provided with a plurality of detachable connecting rods, and the counterweight block is arranged on the upper end of the connecting rod.

[0011] Further, the outer peripheral wall of the ring swivel is uniformly provided with a plurality of connecting holes, and a plurality of connecting rods are respectively screwed in the plurality of connecting holes.

[0012] By adopting the technical scheme, the utility model has the following beneficial effects:

[0013] When the mechanical property test sample clamp is used to clamp the square sample, the square sample is embedded in the square through hole, and the square sample is tightly abutted with one side of the square through hole. Then, the clamping part is tightened to move the square sample, thereby achieving stable fixation of the square sample in the square through hole. Compared with the four-jaw chuck in the prior art, the mechanical property test sample clamp can adapt to square samples of different sizes, without frequent replacement of the chuck and correction of the material center, thereby significantly saving the equipment purchase and maintenance cost, greatly shortening the processing preparation time, and effectively improving the overall processing efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0014] The accompanying drawings, which are part of the present application, serve to provide a further understanding of the utility model, and the schematic embodiments of the utility model and the description thereof serve to explain the utility model, but do not constitute an improper limitation on the utility model. Obviously, the drawings described below are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor. In the drawings:

[0015] Figure 1 The accompanying drawings, which are part of the present application, serve to provide a further understanding of the utility model, and the schematic embodiments of the utility model and the description thereof serve to explain the utility model, but do not constitute an improper limitation on the utility model. Obviously, the drawings described below are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor. In the drawings:

[0016] Figure 2 The accompanying drawings, which are part of the present application, serve to provide a further understanding of the utility model, and the schematic embodiments of the utility model and the description thereof serve to explain the utility model, but do not constitute an improper limitation on the utility model. Obviously, the drawings described below are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor. In the drawings:

[0017] Figure 3 The accompanying drawings, which are part of the present application, serve to provide a further understanding of the utility model, and the schematic embodiments of the utility model and the description thereof serve to explain the utility model, but do not constitute an improper limitation on the utility model. Obviously, the drawings described below are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor. In the drawings:

[0018] Figure 4 The accompanying drawings, which are part of the present application, serve to provide a further understanding of the utility model, and the schematic embodiments of the utility model and the description thereof serve to explain the utility model, but do not constitute an improper limitation on the utility model. Obviously, the drawings described below are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor. In the drawings:

[0019] Reference signs: 1, three-jaw chuck; 2, cylindrical barrel; 3, clamping part; 4, counterweight structure; 5, square sample; 6, square through hole; 31, screw rod; 32, rotating head; 33, right-angle opening; 41, ring swivel; 42, connecting rod; 43, counterweight block.

[0020] It should be noted that the drawings and the written description are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0021] The specific embodiments of the present application will be further described in detail with reference to the accompanying drawings.

[0022] Referring to Figures 1 to 4 As shown in the figure, the embodiment of the present application provides a mechanical property test sample clamp, which comprises a cylindrical barrel 2 and a clamping piece 3. The cylindrical barrel 2 is clamped at one end on a three-jaw chuck 1 of a lathe. A square through hole 6 is formed in the center of the cylindrical barrel 2 along its axial direction. The square through hole 6 is used for placing a square sample 5. Threaded holes are formed in the outer peripheral wall of the cylindrical barrel 2 and extend to the square through hole 6. The clamping piece 3 is screwed into the threaded holes. The clamping piece 3 is used for clamping the square sample 5. The diagonal line of the end face of the square through hole 6 is parallel to the clamping piece 3.

[0023] It should be noted that the size of the square through hole 6 is 21*21mm. The square sample 5 with a side length of 10.5-21mm can be clamped. The outer diameter of the cylindrical barrel 2 is Φ80mm. Multiple clamping pieces 3 can be arranged along the axial direction of the cylindrical barrel 2 to improve the clamping force of the square sample 5. At the same time, it also avoids the square sample 5 from being offset due to force during the moment of contact between the square sample 5 and the tool during the processing of the square sample 5.

[0024] In the above scheme, when the square sample 5 is clamped, the square sample 5 is partially placed in the square through hole 6, so that the square sample 5 abuts against one side of the square through hole 6, and the clamping piece 3 is tightened, so that the clamping piece 3 approaches the square sample 5, thereby fixing the square sample 5 in the square through hole 6. The mechanical property test sample clamp provided by the embodiment of the present application can process square samples 5 of different sizes. Compared with the four-jaw chuck of the prior art, the cost is saved, the time for replacing the chuck and correcting the material center is reduced, and the processing efficiency is improved.

[0025] In some possible embodiments, referring to Figure 3 As shown in the figure, the clamping piece 3 comprises a screw rod 31 which is threadedly connected with the threaded hole. A rotatable rotating head 32 is arranged at one end of the screw rod 31 close to the square sample 5. A right-angle opening 33 is formed at one end of the rotating head 32 away from the screw rod 31. A rubber cushion is arranged on the inner side of the right-angle opening 33 to avoid damage to the edge of the square sample 5 during the fixing of the square sample 5.

[0026] In the above scheme, the right-angle opening 33 increases the contact area of the screw rod 31 with the square sample 5, improves the clamping force of the square sample 5, and the right-angle opening 33 is also used for limiting the square sample 5 to avoid displacement of the square sample 5 along the width or height direction of the square through hole 6.

[0027] In some possible embodiments, referring to Figure 1 With Figure 2 As shown in the figure, an annular groove is formed in the outer peripheral wall of the cylindrical barrel 2 away from the three-jaw chuck 1, and a counterweight structure 4 is arranged in the annular groove. The counterweight structure 4 includes an annular rotating ring 41, which is rotatably arranged in the annular groove. The outer peripheral wall of the annular rotating ring 41 is uniformly provided with a plurality of detachable connecting rods 42, and the upper end of each connecting rod 42 is provided with a counterweight block 43. The outer peripheral wall of the annular rotating ring 41 is uniformly provided with a plurality of connecting holes, and the plurality of connecting rods 42 are respectively screwed into the connecting holes.

[0028] In the above scheme, since the square sample 5 is fixed by the clamping piece 3, the center of the square sample 5 is not in a straight line with the center of the cylindrical barrel 2, and after clamping, the mass center of the clamping system is easy to deviate from the rotation axis. When the main shaft rotates at high speed, the centrifugal force generated by the deviation of the mass center will cause vibration, so that the relative position of the tool and the square sample 5 fluctuates, size errors are generated, and the cutting trajectory is irregular due to vibration, and the surface roughness value rises. The annular groove and the inner side of the annular rotating ring 41 are connected by a bearing and can rotate freely by 360°.

[0029] Working principle

[0030] Unbalance detection:

[0031] The machine tool main shaft drives the cylindrical barrel 2 to rotate idly, a vibration sensor is used to collect real-time vibration signals, and frequency spectrum analysis is used to determine the size (equivalent eccentric mass x radius, unit g・mm) and phase (eccentric direction, unit °) of the unbalance.

[0032] Example 1

[0033] The detected unbalance is 200g・mm, and the phase is 30°, which indicates that the mass center deviates from the axis in the 30° direction, and the equivalent needs to increase the mass in the opposite direction (210°) to balance.

[0034] Counterweight vector compensation:

[0035] The eight evenly distributed connecting holes (with an interval of 45°) on the annular rotating ring 41 are used as mass adjustment points. By installing counterweight blocks 43 of different weights (such as 50g, 100g, and 200g) at specific hole positions, the centrifugal force generated by the counterweight blocks 43 is equal in size and opposite in direction to the eccentric centrifugal force of the square sample 5 by using the principle of vector synthesis.

[0036] Example 2

[0037] Compensate the unbalance of 30° direction, because there is no 30° hole, 100g weight 43 can be installed at 45° and 0° hole respectively, and the vector of the centrifugal force of the two is 100g x √2 ≈ 141g・mm (direction 22.5°, close to the target 30°, the error can be optimized by multiple groups of weight 43).

[0038] Dynamic locking and precision retention:

[0039] The annular rotating ring 41 is connected with the cylindrical tail through a high-precision bearing and can be freely rotated to adjust the phase; after the weight 43 is installed in place, the annular rotating ring 41 is fixed through a locking screw, so as to ensure that the mass distribution is stable and the centrifugal forces are counteracted when rotating at high speed.

[0040] The specific embodiment is only an explanation of the utility model, which is not a limitation of the utility model. Those skilled in the art can make modifications to the embodiment without creative contribution according to the needs after reading the specification, but as long as it is within the protection scope of the utility model, it is protected by the patent law.

Claims

1. A mechanical property test specimen grip, characterized by, The utility model relates to a cylindrical barrel (2) is clamped on the three-jaw chuck (1) of lathe one end, the square through hole (6) is used for placing square sample (5) to be set up in the center of cylindrical barrel (2) along its axial direction, the threaded hole is set up in the outer wall of cylindrical barrel (2) and extends to square through hole (6). Clamping piece (3) is screwed in threaded hole, and clamping piece (3) is used for clamping square sample (5), and clamping piece (3) is parallel with the diagonal line of the end face of square through hole (6). The clamping piece (3) includes a screw rod (31) that is threadedly connected with the threaded hole, and the screw rod (31) is provided with a rotatable rotating head (32) near one end of the square sample (5), and the rotating head (32) is provided with a right-angle opening (33) at the end away from the screw rod (31).

2. The mechanical property test specimen grip of claim 1 wherein, The outer wall of the cylindrical barrel (2) away from the three-jaw chuck (1) is provided with an annular groove, and the annular groove is provided with a counterweight structure (4).

3. The mechanical property test specimen grip of claim 1 wherein, The counterweight structure (4) includes an annular rotating ring (41) that is rotatably arranged in the annular groove, and the outer wall of the annular rotating ring (41) is uniformly provided with a plurality of detachable connecting rods (42), and the upper end of the connecting rod (42) is provided with a counterweight block (43).

4. The mechanical property test specimen grip of claim 3 wherein, The outer wall of the annular rotating ring (41) is uniformly provided with a plurality of connecting holes, and a plurality of connecting rods (42) are screwed into a plurality of connecting holes.

5. The mechanical property test specimen grip of claim 4 wherein, ​

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